Correct spelling for the English word "uroncus" is [jˈʊ͡əɹɒnkəs], [jˈʊəɹɒnkəs], [j_ˈʊə_ɹ_ɒ_n_k_ə_s] (IPA phonetic alphabet).
A urinary cyst, a circumscribed area of extravasation of urine.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.